Braden Scale Calculator — Pressure Ulcer Risk Score

The Braden Scale rests on a specific conceptual model of how pressure injuries form: tissue damage requires both sufficient pressure intensity and duration, and a level of tissue tolerance low enough to be overwhelmed by that pressure. Three subscales address the pressure side. Sensory perception measures whether the patient can feel and report discomfort, activity measures how much they are up and about, and mobility measures whether they shift position in bed or chair. Three address tissue tolerance. Moisture captures maceration from perspiration, incontinence, or wound drainage, nutrition captures the protein and calorie intake needed for collagen synthesis and tissue repair, and friction and shear captures the mechanical forces that occur when a patient slides down a bed with the head elevated, stretching and occluding vessels in the deep tissue over the sacrum. Five subscales are scored 1 to 4 and friction and shear is scored 1 to 3, giving totals from 6 to 23 in which lower numbers mean higher risk. Common cut-offs are 19 to 23 for no meaningful risk, 15 to 18 mild, 13 to 14 moderate, and 12 or below high, with many institutions simply treating 18 or below as the trigger for a prevention bundle. Pooled sensitivity is around 74 percent and specificity around 69 percent. The score is least useful in intensive care, where nearly every patient falls into the high-risk band, and it omits independent risk factors such as diabetes, peripheral vascular disease, vasopressor use, and prolonged surgery.

Systematic pressure sore risk scoring began in the United Kingdom with the Norton Scale, described by Doreen Norton and colleagues in 1962 from a study of geriatric nursing problems in hospital. Norton used five broad categories and was simple enough to be used at scale, but it was criticised for lacking nutrition and for grouping distinct mechanisms together. Barbara Braden and Nancy Bergstrom set out in the mid-1980s to build a replacement grounded in an explicit causal model rather than a list of observations, and published the resulting scale in Nursing Research in 1987 after testing it in nursing home and hospital populations. The Waterlow score, developed in Britain around the same period, took a different approach by adding weighted risk factors such as body build, continence, and surgery. The Braden Scale became the dominant instrument in North America partly because it produced discrete subscale scores that map directly onto interventions: a low moisture score points to barrier products and incontinence management, a low nutrition score to dietitian referral, a low friction score to lift sheets and limiting head-of-bed elevation. Its adoption accelerated when pressure injury prevention became a quality and reimbursement issue, notably after the US Centers for Medicare and Medicaid Services stopped paying for hospital-acquired stage 3 and 4 pressure ulcers in 2008. A pediatric adaptation, the Braden Q, was developed because the original subscale descriptions do not fit infants and young children.